Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a data para a união do grupo para a Europa?
 ###Tabelas: CREATE TABLE 2007_final_statistics (2007_final_statistics_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Airport VARCHAR, Code (IATA/ICAO) VARCHAR, Total Cargo (Metric Tonnes) INT, % Change VARCHAR) CREATE TABLE house_of_savoy (house_of_savoy_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Father VARCHAR, Birth VARCHAR, Marriage VARCHAR, Became Duchess VARCHAR, Ceased to be Duchess VARCHAR, Death VARCHAR, Spouse VARCHAR) CREATE TABLE national_conservatives (national_conservatives_id AUTO_INCREMENT PRIMARY KEY, Group name VARCHAR, English abbr. VARCHAR, French abbr. VARCHAR, Formal European Parliament name VARCHAR, From VARCHAR) CREATE TABLE team_players_drafted_in_the_nba (team_players_drafted_in_the_nba_id AUTO_INCREMENT PRIMARY KEY, Year INT, Round INT, Pick INT, Player VARCHAR, NBA Team VARCHAR) CREATE TABLE list_of_songs_released_in_2008 (list_of_songs_released_in_2008_id AUTO_INCREMENT PRIMARY KEY, Song title VARCHAR, Artist VARCHAR, Year VARCHAR, Genre VARCHAR, Single / Pack name VARCHAR, Release date VARCHAR, Family Friendly VARCHAR, Additional Rock Band 3 Features VARCHAR)  
SELECT From FROM national_conservatives WHERE Group name = group union for europe